Not on the client-side! Sometimes it happens when you're typing the first char, in which case you can hit shift (which is visibly activated) and then type the char. But sometimes it 'autocorrects' when you hit the return key, and the only workaround I've found is to type the password with the first char doubled, and then go back and delete the first of the doubled chars. Not fun, especially when you're navigating the cursor on a touchscreen!

huh - if you disable this in the keyboard settings it still persists? Is it a browser input issue? not fun :D

I don't think there's a granular way to do this, shy of turning off autocorrect in its entirety.